Process for the preparation of an acid-resistant coating on fill

Details Process for the preparation of an acid-resistant coating on fill Process for the preparation of an acid-resistant coating on fill

1990-10-25

1991-08-06

Dixon, Jr., William R.

Compositions: coating or plastic

Materials or ingredients

Pigment, filler, or aggregate compositions, e.g., stone,...

106465, 1621811, C09C 300

Patent

active

050374770

ABSTRACT:
The invention relates to a process for the preparation of an acid-resistant coating and calcium carbonate particles, in which process a slurry of calcium carbonate particles is mixed simultaneously with the solution of a zinc compound and a solution of a silica-containing substance at a temperature of 70.degree.-95.degree. C., the pH being maintained at 8-11.
The invention also relates to calcium carbonate particles having an acid-resistant coating in accordance with the above-mentioned process.
In addition, the invention relates to the use of calcium carbonate particles having a acid-resistant coating in accordance with the above-mentioned process, as an acid-resistant filler in the production of paper at pH 4.0-7.0.

REFERENCES:
patent: 4167423 (1989-09-01), Williams

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